If you tie your success to only how well a company is going to do, you are setting up for fail (And feeling unlucky, and so slightly pissed off at work.). There are too many external factors deciding that.
I measure my success in many ways.
1. Do I havea loving family. Check.
2. Do I have fulfilling hobbies. Check.
3. Do I have enough money to fulfill my responsibilities and hobby, doing things I love. Check.
4. Do I have as much money as I would want to call myself successful. Not yet.
Tying my success to many parameters I can feel a little successful everyday, and continue to feel lucky, and continue to work toward what I would call a successful startup.
1. I carry a Kindle with me. I read a lot and I can do it as well waiting in a office/lounge/Airport as at my bed.
2. I don't value my time more than collective time of four people waiting for me to start a meeting/meetup/lunch.